Asus Crosshair VI - 32 GB (2x16) Memory Recommendation

Hi,

So i plan a build with :
Ryzen 1700x
Asus Crosshair VI

I want 32GB o RAM. I was thinking of getting 2 X 16GB and have the option to upgrade to 64GB in the future. Unfortunately, looking at the QVL (3.16.2017) there are only 3 kits supported (1 at 2400 MHz and 2 at 2133). Is there an updated QVL ? Could i get 2x16 with higher frequencies ?. I want to make sure they will work. I understand Ryzen is a new platform and i don't mind getting my hands a little dirty but at 1000$+ i want things to work properly.